Q2 / 322 · NTA Abhyas (NEET) 2020 · Zoology · Chemical Coordination and Integration

The pituitary gland is located in a bony cavity called ______P______ and is attached to hypothalamus by a stalk known as ______Q_____. It is divided anatomically into an adenohypophysis and a neurohypophysis. Adenohypophysis consists of two portions,_______R________and _______S_______. The _____R______ region of pituitary, produces ______T_______, prolactin (PRL), thyroid stimulating hormone (TSH), adrenocorticotrophic hormone (ACTH) and gonadotropins (luteinizing hormone (LH) and _____U______.

  • A
    P Q R S T U
    Ethmoidal cavity isthmus pars tuberalis pars intermedia GH-RH estrogen
  • B
    P Q R S T U
    Ethmoidal cavity infundibulum pars tuberalis pars intermedia GH estrogen
  • C
    P Q R S T U
    Sella tursica isthmus pars distalis pars tuberalis GH-RH follicle-stimulating hormone (FSH)
  • Correct answer
    D
    P Q R S T U
    Sella tursica infundibulum pars distalis pars intermedia GH follicle-stimulating hormone (FSH)

Solution

I. Adenohypophysis - It is divisible into

A. Pars distalis (anterior pituitary) - Growth hormone (GH), Prolactin (PRL), Thyroid-stimulating hormone (TSH), Adrenocorticotrophic hormone (ACTH), Luteinizing hormone (LH) and Follicle-stimulating hormone (FSH).

B. Pars intermedia - Melanocyte stimulating hormone (MSH).

II. Neurohypophysis (Pars nervosa or Posterior pituitary) - Oxytocin and Vasopressin (or ADH).

- These hormones are actually synthesized by the hypothalamus and are transported to neurohypophysis via hypothalamic neurons. 

Hence, the correct answer is option: 'D'.

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